Pentax Spotmatic Spotmatic Manual - Page 13

Bright

field

focusing

1

You

can

start

viewing

and

focusing

before

and

after

cocking

the

rapid

wind

lever.

When

the

preview

lever

is

in

"AUTO"

(automatic)

position,

and

the

meter

is

at

"OFF",

the

dia-

phragm

is

fully

open

except

for

the

moment

of

exposure.

2

Turn

the

distance

scale

ring

until

your

subject

image

is

clearly

in

focus.

It

is

not

always

necessary

for

you

to

view

and

focus

with

the

diaphragm

fully

open.

In

bright

sunlight,

you

can

easily

focus

with

diaphragm

closed

to

f/5.6

or

f/8

and

still

ob-

serve

the

depth

of

field.

It

is

easi-

er,

however,

to

focus

with

the

dia-

phragm

fully

open

as

your

subject

image

is

much

brighter.

When

the

letters

"MAN"

appears

beside

the

lever,

the

lens

is

in

manual

position;

when

"AUTO"

appears,

it

is

in

automatic

position.

Microprism

Honeywell

Pentax cameras

have

a

Fresnel

lens

with

a

microprism

cen-

ter

underneath

the

ground

glass. As

you

look

through

the

finder,

you

will

see

that

the

Fresnel

lens

consists

of

many

concentric

rings

which

provide

the

brightest

possible

image

on

the

ground

glass.

The

microprism

is

the

center

por-

tion

of

this

diaphragm.

When

your

subject

is

in

focus,

the

image

in

the

microprism

will

be

sharp

and

per-

fectly

clear.

If

your

subject

is

not

in

focus,

the

microprism

will

break

the

image

up

into

many

small

dots,

much

like

an

engraver's

screen.

You

can

focus

your

subject

on

any

por-

tion

of

the

ground

glass.

11

Pentax Spotmatic Spotmatic Manual - Page 13

Bright, field, focusing, Microprism

Page 13 highlights